linux-kernel - Re: intel_ips produces constant load of 1

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Date:	Fri, 25 Mar 2011 19:23:15 +0100
From:	Andreas Hartmann <andihartmann@...enet.de>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org
Subject: Re: intel_ips produces constant load of 1

Jesse Barnes wrote:
> On Mon, 21 Mar 2011 11:04:04 -0700
> Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> 
>>> ps aux | grep ips
>>> root       593  0.0  0.0      0     0 ?        S    17:20   0:00
>>> [ips-adjust]
>>> root       594  0.0  0.0      0     0 ?        D    17:20   0:00
>>> [ips-monitor]
>>>
>>> If the module isn't loaded, the load of the machine in idle mode is 0 as
>>> expected.  
>>
>> This is a reporting problem, and probably due to the schedule() call
>> and associated task state in the ips-monitor thread.  I thought setting
>> the task state to interruptible would prevent this, but it seems like
>> it's not enough for the deferrable on-stack timers?
>>
>> At any rate, it's not actually causing increased CPU usage, so you can
>> safely ignore it until we have a fix.
> 
> Oops, one task uses interruptible correctly, but the monitor thread
> doesn't.
> 
> Does this patch fix your load average?

The patch works fine:

ps aux | grep ips
root     22427  0.0  0.0      0     0 ?        S    19:15   0:00
[ips-adjust]
root     22428  0.0  0.0      0     0 ?        S    19:15   0:00
[ips-monitor]



btw: what does this mean (first line):


kernel: [ 6610.030205] intel ips 0000:00:1f.6: CPU TDP doesn't match
expected value (found 25, expected 29)
kernel: [ 6610.030218] intel ips 0000:00:1f.6: PCI INT C -> GSI 18
(level, low) -> IRQ 18
kernel: [ 6610.030733] intel ips 0000:00:1f.6: IPS driver initialized,
MCP temp limit 90


Thank you,
kind regards,
Andreas
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